过敏是常见的。在发达国家,约有20%的人患有过敏性鼻炎,约6%的人患有至少一种食物过敏,约20%的人在某个时间点患有特应性皮炎。根据国家/地区的不同,大约1–18%的人患有哮喘。过敏反应发生在0.05–2%的人群中。许多过敏性疾病的发病率似乎正在增加。 1906年,克莱门斯·冯·皮奎特(Clemens von Pirquet)首次使用了“过敏”一词。
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